Dunkirk DXL Series - Manual (Page 12)

12
When an existing boiler is removed from a common
venting system, the system is likely to be too large for the
proper venting of the appliances sill connected to it. If
this situation occurs, the following test procedure must be
followed:
1. The vent pipe must slope upward from the boiler not
less then ¼ inch for every 1 foot (21mm/m) to vent
terminal.
2. Horizontal portions of the venting system shall be
supported rigidly every 5 feet and at the elbows. No
portion of the vent pipe should have any dips or sags.
3. This boiler series is classifi ed as a Category I. Vent
installation shall be in accordance with "Venting of
Equipment," of the National Fuel Gas Code, ANSI
Z223.1/NFPA 54, or applicable provisions of the local
building codes.
4.
Inspect chimney to make certain it is constructed
according to NFPA 211. The vent or vent connector
shall be Type B or metal pipe having resistance to heat
and corrosion not less than that of galvanized sheet
steel or aluminum not less than 0.016 inch thick (No.
28 Ga).
5. Connect fl ue pipe from draft hood to chimney. Bolt or
screw joints together to avoid sags. Flue pipe should
not extend beyond inside wall of chimney. Do not
install manual damper in fl ue pipe or reduce size of
fl ue outlet except as provided by the latest revision of
ANSI Z223.13.. Protect combustible ceiling and walls
near fl ue pipe with fi reproof insulation. Where two or
more appliances vent into a common fl ue, the area of
the common fl ue must be at least equal to the area
of the largest fl ue plus 50 percent of the area of each
additional fl ue.
7 - VENT INSTALLATION
8 - VENT SYSTEM MODIFICATION
REMOVAL OF BOILER FROM VENTING SYSTEM
At the time of removal of an existing boiler, the following
steps shall be followed with each appliance remaining
connected to the common venting system placed in
operation, while the other appliances remaining connected
to the common venting system are not in operation.
1. Seal an unused opening in the common venting
system.
2. Visually inspect the venting system for proper size and
horizontal pitch and determine there is no blockage or
restriction, leakage, corrosion and other defi ciencies
which could cause an unsafe condition.
3.
Insofar as is practical, close all building doors and
windows and all doors between the space in which the
appliances remaining connected to the common venting
system are located and other spaces of the building.
Turn on clothes dryers and any other appliance not
connected to the common venting system. Turn on
any exhaust fans, such as range hoods and bathroom
exhausts, so they operate at maximum speed. Do
not operate a summer exhaust fan. Close fi replace
dampers.
4.
Place in operation the appliance being inspected. Follow
the lighting instructions. Adjust thermostat so appliance
will operate continuously.
5. Test for spillage at the draft hood relief opening after
5 minutes of main burner operation. Use the fl ame of
a match or candle, or smoke from a cigarette, cigar or
pipe.
6.
After it has been determined that each appliance
remaining connected to a common venting system
properly vents when tested as outlined above, return
doors, windows, exhaust fans, fi replace dampers and
any other gas burning appliances to their previous
condition of use.
7. Any improper operation of the common venting system
should be corrected so the installation conforms with
the National Fuel gas Code, ANSI Z223.1/NFPA 54.
When re-sizing any portion of the common venting
system, the common venting system should be re-sized
to approach the minimum size determined using the
appropriate tables in Chapter 13 of the National Fuel
Gas Code, ANSI Z223.1/NFPA 54.
WARNING
Boiler and venting installations shall be performed
by a qualifi ed expert and in accordance with the
appropriate manual. Installing or venting boiler
or other gas appliance with improper methods or
materials may result in serious injury or death due
to fi re or to asphyxiation from poisonous gases such
as carbon monoxide with is odorless and invisible.
!
WARNING
Do not connect boiler to any portion of mechanical
draft system operating under positive pressure.
!